An α-particle of 10MeV collides head-on with a copper nucleus (Z = 29) and is deflected back. Then, the minimum distance of approach between the centres of the two is:

1
8.4 × 10−15 cm
2
8.4 × 10−15 m
3
4.2 × 10−15 m
4
4.2 × 10−15 cm

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